Ventilating system for drying apparatus



i Sep-f. I5) 1925;

c. sTlcKLE VTILATI'Ng' SYSTEM FOR DRYING APPARATUS -Filed Nov. 26. 1923A INVENTOR. 0oz: r/ c2415.

BY S

' ATTORNEYS.

Patented Sept. 15, 1925.

UNITED STATES P AT ENT F IIC COLE STICKLE, OF INDIANAPOLIS, INDIANA, ASSIGNORT01STIGKLES'IEAIVIl SPECIAL- TIES COMIANY, 0F INDIANAPOLIS, INDIANA, A CORPORATION.

VENTILATING SYSTEM: FOR DRYING; APPARATUS; I

Application filedNovember. 26, 1923. Seriall No., 677,046.

ventilation of. rooms.- in.. which is, locatedI a drymgmachi-ne or any machinef-romiwhlch vapor arisesgi- This object, is attained by, -means for removing all the vapor f -rom the machine and dischargingl out; of the, room so that the air in the room away from the machine willbe dry, and normall at all, times.

Heretofore. the vapor rising', from. such a machine condenseson the; roof or any structure in the room above the machine, and drops down on the machine andthe work` passing through the machine. Take, for. example, paper making machines, for which this invention. was punposely made, the paper is injuredl by the dirty condensation water that drops down uponit andalsothe roof is soon ruined. and the. other parts.4 of the room,vv because they are constantly saturatedwith moisture. Theobject of; this invention is to obviate all that trouble andavoid all vapor or moisture in such. room, excepting whatl is immediately in the ma chine and above it, inv the hood,I through;

which the moisture or vapor; is removed.

The full natureofv the invention willA be understood from the accompanying drawings and the following descriptionl and claims.

In the drawings, Figure 1 is a vertical section through a building showing in side elevation a paper making machine equipped with the invention herein,iparts being brokeny away. Fig. 2 1s a transverse-section through.

the building and showing themechanismA in end elevation, parts being broken away. Fig. 3 is a section substantially on, the line 3 8 of Fig. 1 through one wall and; the Ventilating hood and associated means.A

The building has a basement floor 10,t a mailn floor 11, walls 1'2 and. roofl. A

paper machine is mounted on; the main floor 11, iL having the usual cylinders 15 mounted in side supports 16 and 17 and side gearing 18 and steam pipes 19.l Below the main floor therel are steam supply pipes 2Ov and 21a, heater 22 and a fafn23. for discharging the heated air into: the building; above the, main floor 11, through a pipe 24, asshown in. Fig., 2.V t

Over the paper making machine there is constructed the hood 25v extending for the full length andAY Widthl of the machine, A'.- shaped in cross sect-ion and having a curtain 26 extending down from its margins soA as tov embraceI they upper,A part, of the paper making machine to some degree substantial'- ly as shown. Along each lower lateral edge. ofthe hoodA inside thereofthere extends a. box-like conduit 27 with perforated walls. From. said horizontal and, longitudinally extending conduits 27 at intenvals there are,v conduits or pipes 28 leading upward. In. the topof the hood there is, a longitudinal draft chamber 30, preferably dropped somewhat below the top of the hood, thewallsof which areperforated so that-.the vapor rising fromthe cylinders andmain body ofthe ma# chine will pass through; theperforations andk entersaid draft chamber 30. The lateral air conduits28also discharge at thein upper ends into said longitudinal drafty chamber 30. Beside the middle of the hoodl therefis a multi-blade exhaust fan 31 connected with, the central partof` said draft chamber 30. by a pipe or conduit 32 and there isa chimney or vent pipe 33 leading from the fan upthrough the rooff13 andv discharging intoithe open air;

The capacity of the fan and associated inlet and' outlet pipes 32 and` 33 is such as to create some degree of suction or partial vacuum ins the draft chamber 30` and the lateral conduits 2,8' so that all vapor or steam rising from any part ofthe machine will' be carried away by said apparatus.

The air pressure in the hood is substantially uniformk and balanced` throughout, because the transverse area of the draft chamber increases. from itsends towards its middl'e portion` from which the iiue, pipe 32 leads. This increase in the size of'chamber 3() is iny proportionto the transversel area of the tubes 28entering the same-from point to point. Thus the chamber 30, at the entrance-of the first pair of tubes 28 near the small end of the chamber, has substantially the same transverse area asthe two tubes 28. At the entrance 'of the second pair oftubes 28, the transverse area of the chamber 30 is doubled and it increases correspondingly as other tubes 28 enter it until the outlet at the middle of chamber 20 is reached. Also the tubes 28 vare of uniform size and are so throughout their length. This is true also of the side conduits 27. The inlets or perforations to the conduits 27 and 30 also bear substantially the same proportion to the transverse areas of the chambers or tubes which they enter. Wherefore, a uniform balanced pressure will be maintained throughout the hood chamber 30 and conduits 27 and 28, but it will be slightly less than atmospheric pressure because of the suction of the flue pipe 32. Hence, the moisture or vapor rising from the rolls over which the wet paper travels will rise into the central part of the hood and be carried off through the perforations in the walls of the draft chamber 30, whereas the vapor from the sides or lateral portions of the machine and what air is drawn in under the sides of the curtain 26 will pass out through Y the conduits 27 and tubes 28 into the upper part Vof the draft chamber 30.

Thus, as heretofore stated, the construc tion is such that the moisture and vapor will be constantly removed and the air in the room away from the machine be in normal condition.

The heat in the building coming from the heater and fan in the lower part thereof is discharged at the top of the building or l roof. It is delivered by the fan 23 into the drying machine room above the main floor in a volume to cause a slight air pressurer therein. The roof has no ventilation and,

therefore, the warm air discharged in the upper part of the drying room will build down therein to the level of the lower part of the curtain 26 of the hood and any surplus will pass out through the hood. This body of heated air in the upper part of the drying room above the lower edge of the wood will prevent any moisture rising from the machine to the roof where it would condense and drop, asis now the case in practi cally all paper machine rooms. The body of heated air will build down and the circulation or removal of air from the room will occur at and below the line of the draft tubes 27 in the machine hood. This absolutely prevents any moisture from the dry ing machine escaping into the room and condensing on the roof or walls of the building, which is a very important feature of this invention, and the static pressure in the hood is such that all the moisture and surplus heated air will pass out through the ventilating apparatus.

Thus in a paper machine making 60,000 pounds of paper in 24 hours, the vaporthrown off by drying would be approximately 140,000 pounds, which would equal 5,833 pounds per hour, or 93.3 cubic feet of water. This illustrates the lamount of moisture or water that must be removed and the importance of its removal. This water expanded into steam or vapor form equals 161,280 cubic feet volume-per hour, or 2,688 cubic feet per minute. Hence, a fan should be of suflicient capacity to remove at least 2,688 cubic feet of vapor per minute in a paper machine of the capacity indicated.

The importance andvalue of this system of ventilation is indicated by the fact that the volume of heated air heretofore used for removing the vapor by absorbing i't was about 500 C. F. M. lVith this system of Ventilating, the vapor can be removed with less than 100 C. F. M., `which will be just enough to give an air change in the room. That will give the necessary fresh air ventilation.

The invention claimed is:

1. Means for removing vapor from a machine employing moisture, including a hood mounted immediately above said machine and which has a plurality of conduits with perforated walls, a flue conduit leading from said hood, and exhaust means in said flue conduit for maintaining a pressure in said hood less than atmospheric pressure, the relative transverse areas of the conduits in said hood and the perforations in the walls of such conduits being such that the air pressure in them will be substantially uniform. l

2. Means for removing vapor from a machine employing moisture, including a hood mounted immediately above said machine, a flue conduit leading from said hood, and exhaust means in said flue conduit for maintaining a reduced 'air pressure in said hood, said hood having a substantially central inlet chamber for the vapor coming from the machine and also lateral inlet conduits leading to said chamber from the margins of the hood and the relative transverse areas of the conduits and chamber of said hood being such that the air pressure therein will be substantially uniform.

3. Means for removing vapor from a inachine employing moisture, including a hood mounted immediately above said machine, a flue conduit leading from said hood, exhaust means in said flue conduit for maintaining a reduced air pressure in said hood, said hood having in the central part thereof a depending longitudinally-extending draft chamber with perforated walls for the exit of the main portion of the vapor from the machine, a longitudinally-extending chainber along each side of the hood with per forated walls, and conduits leading at intervals from said side chambers to said central draft chamber, substantially as set forth.

4. Means for removing vapor from a machine employing moisture, including a hood mounted immediately above said machine, a flue conduit leading from said hood, eX haust means in said flue conduit for niaintaining a reduced air pressure in said hood, said hood having in the central part thereof a depending longitudinally-extending draft chamber With perforated Walls .for

the exit of the main portion of the vapor from the machine, a longitudinally-extend ing chamber along each side of the hood' With perforated Walls, conduits leading at intervals from said side chambers to said central draft chamber', and a curtain eX- tending down from the margins of said hood so as to envelope the upper portion mounted immediately 'above said machine, a flue conduit leading from said hood, eX- haust means inl said flue conduit for maintaining a reduced airl pressure in said hood,

to the ends thereof and with perfo-rated Walls for the exit of the main portion of the vapor from the machine, a longitudinally-eXtending chamber along each side of the hood with perforated Walls, and conduits leading at intervals from `said side` chambers t0y said central draft chamber, substantially as set forth. c f

In Witness whereof, ,I have hereunto affixed my signature.

COLE STICKLE. 

